Using XStream to set xmlns attribute (xml namespace)

Thoughtworks xstream does not have an API to add xmlns attribute to xml root element. There is a work around to do the same using their useAttributeFor() API. Its a bit of hack but serves the purpose.

java pojo
public class TestXmlns {
    private String name;
    private String address;
    private String xmlns;
   
    ...get/set for above attributes.
   
}

create an instance of xstream and add below configuration
xstream.useAttributeFor(TestXmlns.class, "xmlns");

Example:
TestXmlns x1 = new TestXmlns();
x1.setName("abc");
x1.setAddress("zyx");
z1.setXmlns("http://com.company.mytest");

XStream xstream = new XStream();
xstream.useAttributeFor(TestXmlns.class, "xmlns");

String xmlString = xstream.toXML(x1);

output
<TestXmlns xmlns="http://com.company.mytest">
    <name>abc</name>
    <address>xyz</address>
</TestXmlns>